He
has been charged with one count of transporting hazardous materials,
over the grenade, and made a brief court appearance Tuesday.

'This clearly looks like an error,' Tom
Blank, a former deputy administrator at the Transportation Security Administration, told Huffington Post of
the grenade. 'Something slipped through that should not have slipped
through.'

Harris is being held until his next court appearance on Friday.

Federal
officials say the smoke grenade is prohibited on board passenger
aircraft, but the hatchet, knives, clubs and other items authorities
found in Harris' luggage don't violate Transportation Security
Administration guidelines for what can be carried in checked bags.

The security threat took place at LAX, as Harris touched down from Japan

Bulletproof vests and flame-resistant pants are also not listed among items prohibited aboard flights.

According to the TSA, a wide range of weapons are allowed in checked baggage, but not in a carry-on.

For
example, you can pack knives, meat cleavers, sabers and swords in your
checked luggage, as well as brass knuckles, throwing stars, billy clubs
and night sticks.